Labranza convencional y de conservación en el cultivo del frijol bayo Tuy (Vigna unguiculata l).

The objective of the research was to compare the energy cost of the main mechanized farming operations, making emphasis in the tillage/sowing and to quantify its possible yield and savings using the system of no-till sow with covering, related to the conventional system, assuming that it is possible to reduce the energy costs in more than 10 %, in the operation of the agricultural machinery, in the cultivation of the bay bean Tuy, of the Company Riecitos of the Municipality Freites, Anzoátegui, Venezuela. It was used in the experimental design, a variance analysis for the determination of the existence of significant differences between the arithmetic population means of each variable and the applied treatments. For the determination of the energy and exploitation costs was used the program “Energy and Exploitation Costs (EEC)." In each experimental unit were studied apparent density, humidity and resistance of the soil, fuel consumption and energy cost. Te study concludes that there are no significant differences in the apparent density, humidity, resistance of the soil. In the studied depths, the physical-mechanical characteristics of the soils of the parcels don't interfere in the application of the treatments. The system with less energy cost, expenses of exploitation and consumption of fuel, was that of conservation. The technology used in the conservation system show a manpower saving, being invested less time (4 h•ha-1) of use of the machinery. [ABSTRACT FROM AUTHOR]